libsensors: Treat devices without a known ancestor bus as virtual

Currently only hwmon devices that don't have a parent device are treated
as virtual. Let's extend the concept to hwmon devices, that don't have
a *recognized ancestor* device (hwmon devices that according to the kernel
don't reside on a bus that we recognize). This change is meant to address
cases where a hwmon device has a thermal class device for a parent, but
the thermal class device doesn't have a parent device.

These kind of hwmon devices started appearing in the 4.19 kernel
due to commit f6b6b52ef7a54160c0. It was not reported as a kernel
regression and fixed in the kernel, because according to
Documentation/admin-guide/sysfs-rules.rst, the change was OK to make
(it says "Position of devices along device chain can change").

Fixes #139

Signed-off-by: Ondřej Lysoněk <olysonek@redhat.com>

0 files changed, 0 insertions, 0 deletions